Fixes #2962: Increase ExportTemplate mime_type field length

netbox/extras/migrations/0017_exporttemplate_mime_type_length.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.1.7 on 2019-03-05 18:07
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('extras', '0016_exporttemplate_add_cable'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='exporttemplate',
+            name='mime_type',
+            field=models.CharField(blank=True, max_length=50),
+        ),
+    ]

netbox/extras/models.py

@@ -357,7 +357,7 @@ class ExportTemplate(models.Model):
     )
     template_code = models.TextField()
     mime_type = models.CharField(
-        max_length=15,
+        max_length=50,
         blank=True
     )
     file_extension = models.CharField(